condition mean min max ZT0-3 4.6895050000000005 4.6895050000000005 4.6895050000000005 ZT4-7 8.073220000000001 8.073220000000001 8.073220000000001 ZT8-11 3.832165 3.832165 3.832165 ZT12-15 2.992235 2.992235 2.992235 ZT16-19 5.651615 5.651615 5.651615 ZT20-23 5.4226600000000005 5.4226600000000005 5.4226600000000005